Lifting jack



J. R. KINNEY Feb. 10, 1925? LIFTING JACK Filed March 5 liwenior: Justus E-Jfinney.

d a This invention relates to Patented Feb. 10, 1925.

v. UNITED STATES PATENTOFFICE.

JUSTUSR, KINNEY, OF JAMAICA PLAIN, MASSACHUSETTS.

. LIFTING JACK.

Application filed March 5, 1924. SerialNo. 697,121.

To all whom a may concern:

Be it known that I, JUsrUs R. KINNEY, a citizen of the United States of America, and a resident of Jamaica Plain, in the county of Suffolk, in the/State of Massachusetts, have invented certain new and useful Im provements in Lifting Jacks, of which the following: is a specification.

lifting jacks for use inconnection with motor vehicles having balloon tires on the wheels thereof, the object being to; provide a simple device of this character particularly adapted for lifting light weight vehicles such asFord cars.

a The invent-ion consists primarily of abase having a vertical post thereon with ratchet teeth on opposed'sides thereof and a carriage movable endwise of said post and carrying a lever provided with pawls adapted to engage the teeth to cause the carriage to be moved upwardly on said post.

The invention consists further of certain novel featuresof construction and arrangement of parts which will be understood readilyby reference to the description of the drawings and to the claims to be hereinafter given. Y I I For the purpose of illustrating the invention, one preferred form thereof is illus trated in the drawings, this form having been found to. give satisfactory and reliable results although it is to be understood that the various instrumentalities of which the invention consists can be variously arrangedand organized and the invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described except as required by the scope of the appended claims.

Of the drawings:

Figure 1 represents a vertical section of a lifting jack embodying the principles of the present invention.

Figure 2 represents a horizontal section of same, on line 2, 2, on Fig. 1, and

Figure 3 represents an elevation of one of the pawls.

Similar characters indicate like parts throughout the several figures of the drawm s. y

Tn the drawings 10 is a post having ratchet teeth 11 on opposite faces thereof, the lower end of said post being preferably secured to a base 12 by means of a pivot pin 13. 7

By pivotally connecting the base 12 tothe i post 10 the latter may be retained in a vertical position when the former rests upon uneven ground.

Straddling the p-ost 10 is a carriage 14L ,60

consisting of a- Ushaped plate the open end of which has disposed therein near the top thereof, a pin 15 upon which is positioned a roller 16. y g

This roller 16 has cylindrical end flanges" 17 on the periphery thereof, said flanges bearing on the plane faces 18 on opposite sides of the teeth 11;

The carriage 14- has a laterally extending support 19 the upper end 20 of which is, inclined downwardly toward the post 10 so that when an axle A is positioned thereon bearing against the. vertical edges 21 of the carriage 1 1, the accidental displacement of said axle A from the support 19 will be. effectually prevented.

The carriage 14 is also provided preferably with a pin 22 O11 which is disposed a roller 23 the end cylindrical flanges 2 10f which bear upon the vertical plane faces 18 of the post 10 and assist the roller 16 in preventing the tilting of the carriage 14 when a load is. disposed upon the support 19.

When a load is being lifted by said sup-- poi-i319 the natural tendency would be to tilt the carriage 14 causing the parts thereof to bind upon the post and prevent free movement of said carriage lengthwise of the post.

By the use of the roller 16 this binding and cramping is efiectually prevented and the roller 23 assists in attaining this de sired result.

At a point opposite the center of the post 10 a bifurcated lever 25 is pivoted at 25 to the side walls of the carriage 14. This bifurcated lever 25 has pivotally mounted thereon the weighted pawls 26, 27 which by their weight are adapted to engage the teeth 11 on the opposite faces of the post 10.

lVhen the pawl 26 is in engagement with a tooth 11, it is obvious that if the handle '28 of lever 25 is lifted sufficiently to cause the pawl 27 to engage a higher tooth 11 the carriage lh will be moved. upwardly relatively to the post 10 and if the handle 28 is moved downwardly when said pawl 27 is in engagement with a tooth 11 a farther upward movement will be imparted to the carriage 1%.

raised position by the engagementof the pawls 26, 27 With the teeth 11 hen it is desired to lower the load it is necessary to provide means for disengaging the paWls 26, 27 fronithe teed-1 11.

For this purpose (3W0 triggers 29, 30are pivotally' mounted upon' the transverse pin 31011 the bifurcated lever 25.

The-trigger 29 is connected by alink'BQ to an arm extending u nvardly fr'omthe paiV-IQG and when the trigzfger-29 is moved inthe direct'ion of-arrow' a on Fig; 1 the awl 26"w-ill be'inove'dabout its pivot and disen aged fronr the-ratchet teeth 11;

The pawl 27 is connected by-a lii'ik 34 Wit-h the trigger" 30" and i when this trigger 30'is moved in-th edirec'tion of arrow a said pawl 2-7 4 will he disengagedWtroin' the teeth 11.

The triggers'29, 30 inay be-actua'ted alteruately if desired and' the load lowered slowly by moving.- the lever E25"about its pivot retai'i'iing on'eptrWl' in engagement with a tooth While'theother pawl is beingloivered into positionto engage adower tooth;

If preferred, however, both triggersniay be simultaneously moved about the pin" 31 thereby disengaging bo't1r aw1e26fl7 from the teeth 11 and permitting-thevehicle 10 drop to the-ground.

This lifting jack is articularly adapted for use in connection with light \veiglit'cars such as'Fords. v

This lifting, jack may be" cheaply cont-ion.

It" is believedthe operation and many Boston,

advantages of the invention Will be apparent Without" further description Having thus described my invention, I claim- I 1. Thecombinationof a base; a post extending upwardly therefrom and having on opposite faces thereof a plurality of ratchet teeth and unbroken tracks on opposite sides of said teeth; a carriage movable endwise of said post; a lever pivoted to said carriage; Weighted members pivoted 'to said lGVG'I alternately adapted to engage the teeth on opposite 'faces'ofsaid post; and rollers mounted on said carriage near the top and bottom thereof and adapted to engage said tracks on 'opposite sides' of said post to prevent the tilting of said carriage under a load.

2." The combinatioirof a base a post exten'ding'upwardly therefrom and having on opposite faces thereof arpluralit'y'of ratchet teeth and 'unbrokeirtraoks on opposite sides ofsaid teeth; a carriage consist-ingot a U- shape'd"platehaving a late-rally extending support and '1novableendw'iseof said post; a lever pivoted to 'said' carriage; Weighted HlGHlbe'l'S pivoted to said lever at points equidistant from' thelever pivot and alternately adapted to engage the teeth on opposite faces of said post; and rollers mounted'on' saidcarriage near'the top and bottom thereof andadaptedto engage said tracks on oppositesidesot said post'to prevent the tilting of said carriage under a' load.

Signed by me' at 746 Old South Building, Massachus'e'tts, this l-th' day or" March, 1924?. 7 v I r JUSTUS KINN'EY. VVitnesse's WALTER E, L'oMBARo; NATHKNO. LOMBARDI' 

